technologies allow natural gas producers to supply affordable, cleaner energy, while protecting our environment. across america, these technologies protect air - by monitoring air quality and reducing emissions... ...protect water - through conservation and self-contained recycling systems... ... and protect land - by reducing our footprint and respecting wildlife. america's natural gas... domestic, abundant, clean energy to power our lives... that's smarter power today. begins with back pain and a choice. take advil, and maybe have to take up to four in a day. or take aleve, which can relieve pain all day with just two pills. good eye. which can relieve pain all day with just two pills. dad vo: ok, time for bed, kiddo. lights out. ♪ (sirens) (train horn) ♪ vo: wherever our trains go, the economy comes to life. norfolk southern. one line, infinite possibilities. >>> we're back with tonight's outer circle where we reach out to our sources around the world. we begin in tunisia, where protesters have taken to the streets in support of a woman who was charged with public indecency after she was